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        <title>Document</title>
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                box-sizing: border-box;
            }
            #box {
                height: 300px;
                background: #aef;
            }
        </style>
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    <body>
        <div id="box">
            <a href="http://atguigu.com">尚硅谷</a>
            <input type="text">
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        <script>
            let box = document.querySelector("#box");
            let a = document.querySelector('a');
            let input = document.querySelector('input');

            //绑定事件
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            a.ontouchstart = function(e){
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